Question

bogdan are cu 40 de lei mai mult decat adrian, adrian are de 3 ori mai putin decat rada, iar rada cu 20 de lei mai putin decat bogdan. ce suma are fiecare?

Answer 1

[tex]b=a+40 \\ r=3a \\ b=r+20=3a+20 \\ ---------- \\ a=?b=?r=? \\ ---------- \\ Inlocuim: \\ a+40=3a+20 \\ 2a=20 \\ \boxed{a=10} \\ r=3*10 \\ \boxed{r=30} \\ b=10+40 \\ \boxed{b=50}[/tex]